Blood is carried towards the heart by __________?
Correct answer: C. Veins
- A. Arteries
- B. Capillaries
- C. Veins
- D. none of these
Explanation
Veins return blood towards the heart, using valves and surrounding muscle contractions to prevent backflow, although pulmonary veins are an exception to the usual oxygen-content pattern. Students may choose arteries because they carry blood away from the heart, which is the opposite direction asked here.
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